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  • Title: [Effects of drought stress at the bud stage on quality of cut lily.].
    Author: Cui GF, Du WW, Duan Q, Wang XN, Ma LL, Wu LF, Jia WJ.
    Journal: Ying Yong Sheng Tai Xue Bao; 2016 May; 27(5):1569-1575. PubMed ID: 29732819.
    Abstract:
    Under the climatic conditions of the central Yunnan, with oriental lily cultivar 'Sorbonne' as material, the influences of different degrees of drought stress on physiological and biochemical changes of leaf and on quality of cut flowers after re-watering during the growth of bud were studied. The results showed that as the period of drought stress extended, the levels of leaf relative water content and chlorophyll content decreased significantly, while the stomatal density, MDA and proline content increased. Under mild drought, MDA increased slowly while it rose rapidly in the later stage of moderate drought stress, indicating that severe drought aggravated harm to the plasma membrane and ultimately affect the synthesis of MDA. Proline only experienced some slight changes in early period of mild drought, however, it increased sharply under severe drought conditions, which indicated that the sensitivity of proline to water deficit was lower than that to MDA. From re-watering to flowering, the effects of drought during bud growth reflected abnormal flowering traits. Compared with the normal group, there were significant differences in shoot growth, plant height, flower diameter, length and width of petal and flower pigment content. All indicators were in verse relation with the length of drought stress period because a longer drought period resulted in shorter plants, smaller flowers, shallower color. The differences among seven treatments during the flowe-ring stage of leaf morphology (length and width) were not significant. The drought during bud stage resulted in the delay of the flowering time, and the flowering quality of plants experiencing severe drought stress could not return to the normal levels even after re-watering. Overall, mild drought during early period had small influence on the quality of lily cut flowers as well as the grade of flo-wering branches. Under moderate or severe drought, the quality of cut flowers declined dramatically and even lost their commercial values. 以东方百合品种‘Sorbonne’为材料,在滇中气候条件下研究蕾期不同程度干旱对百合叶片生理生化指标和复水后切花质量的影响.结果表明: 随着干旱时间的延长,百合叶片的相对含水量和叶绿素含量大幅下降,气孔密度、丙二醛(MDA)和脯氨酸含量均上升.轻度干旱下,MDA含量上升缓慢,中度干旱后期上升较快,重度干旱使质膜受到的损害加重,最终影响MDA的合成.脯氨酸在轻度干旱早期变化微小,至重度干旱时增幅骤然加大,说明其对水分亏缺的敏感性较MDA低.复水至开花期,蕾期干旱对植株花期性状的影响表现为: 新梢生长量、株高、花径、花瓣长、宽和花色素含量均与对照差异显著,各性状指标与植株经历的干旱胁迫时间呈反比,即蕾期干旱时间越长,切花植株越矮,花朵越小,花色越浅.7个处理间花期叶部形态(长和宽)变化不显著.蕾期干旱使花朵开放时间延后,经历中、重度干旱的植株复水后花枝质量无法恢复到正常水平.综上,早期轻度干旱对百合切花质量影响较小,尚未造成花枝等级降低,中、重度干旱使切花质量严重下降,失去商品价值.
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